[vlc-devel] additional decoder support
Matthew.Romaine at jp.sony.com
Mon May 17 06:22:47 CEST 2004
Thanks Gildas for suggesting which decoders to look at.
I'm a little bit confused in how "packetizers" and "blocks" are used.
In poking around the other decoders (mpeg_audio.c and flac.c), I've
noticed extensive code in handling different states (STATE_NOSYNC,
etc.). The questions that (I think) will help me along are:
1) are packetizers used for creating "frames" of audio for network
2) is flac.c's PacketizeBlock used to ensure a decode-able frame of
data is received before actually decoding the data?
In a hypothetical situation for the decoder I am working with, I need
to have a certain fixed-size frame of raw data before I can send it
along to the decoder. I'm still trying to get my head wrapped around
the pipeline, but would someone kindly fill in the blanks below? :
(blank - who calls OpenDecoder?) --> flac.c's DecodeBlock gets called
--> (blank - where does the buffer go?)
any other comments/suggestions on where I should look would be much
appreciated. Ultimately my goal is to incorporate a network-streamed
version running (I already have a liveMedia test-app working), so if
there are certain network-related issues I should consider, please
comment as such.
On 2004/05/14, at 18:03, Gildas Bazin wrote:
> On Friday 14 May 2004 10:16, Sigmund Augdal wrote:
>> Look at the doxygen docs. They are incomplete, but up to date.
>> And use a simle decoder as a reference.
> The faad or lpcm decoders are ones of the most simple ones so I'd
> having a look at them (the lpcm one also includes a packetizer which is
> used for the stream output layer but you can ignore it).
> The decoder api has changed recently so the documentation is outdated
> that respect. Decoders don't run in their own threads anymore, they
> more like a filter design, ie. data in -> allocate buffer out ->
> data -> return buffer out.
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